Drilling-machine.



J. PETRIE.

DRILLING MAGHINE.

APPLICATION FILED APB..14, 190B.

Patented Apr. 6, 1909.

- UNITED STATES PATENT orr'ron.

JAMES PETRIE, or ROSSLAND, BRITISH COLUMBIA, CANADA.

DRILLING-MACHINE.

Specification. of'Letters Patent.

Patented April 6, 1909.

7 Application filed April 14, 1908. Serial No. 427,027.

To all whom it may concern:

Be it known that 1, lanes PETRIE, a subject of the King .of GreatBritain, residing at Rosslalnd, British Columbia, Dominion of Canada,have invented a new and useful Drilling-Machine, of which the followingis a specification.

This invention relates more particularly to i the front heads ofdrilling-machines employed for-mining or other analogous purposes, andthe primary object is to provide a structure that is much more simplethan that now in general use,is more effective, provides betterfacilities for packing, and is' less expensive in the cost ofmaintenance. The preferred form of construction is illustrated in theaccompanying drawings,

wherein I Figure 1 is a plan view of aportion of the drilling machineshowing the novel head in place on the cylinder. Fig. .2 is alongitudinalsectional view through the same. Fig. 3 is a cross sectionalview on the line 33 of Fig. 2. Fig. 4 is a detail perspective View ofone of the bushing sections.

Similar reference numerals designate corresponding parts in all thefigures of the drawings.

In the embodiment illustrated, a portion of a cylinder is shown, and isdesignated 5. Within this cylinder operates a'reciprocat ory piston 6having a piston rod 7 that projects from one end of the cylinder.Associated with said end of the cylinder is a head comprisingthree-pieces, anlouter shell 8 anda bushing composed of two sections 9;

The bushing consists of an outer portion 1 that tapers outwardly andcontinuously from its portion of great r.diameter and an inner neck, thelatter fitting within the end of the cylinder, and the inner end of thetapered portion or in other words the portion of greatest diameter beingin line with and of the same diameter as the end of such cylinder.Packing 11 is referably interposed between said'ends. T e bushing has acentral longitudinal bore 12 formed artially in each section... and insaid bore tile iston rod 7 operates. Said bushing is furt ermoreprovided with-two internalannular grooves 13 formed partially in. eachsection and arrange thto receive packin rings 14 of leather orother'suitable materia The shell 8 has an internal bore tapered tocorrespond to the taper of the outer portion of the bushing, said shellsurrounding said theend. of the cylinder.

bushing and holding the sections thereof together. The inner end portionof the shell covers the. packing 11' and slightly overlaps It isfurthermore providedwith a pair of opposite outstanding ears 15, throughwhich are passed, the usual made of cast iron cored out to receive the Apacking rings While the outer shell. is made of steel that surrounds.and protects the' bushing.

It will be evident that the structure is. very simple, and that it canbe cheaply manufactured. Moreover it. hasproven entirely effective andis very advantageous, inasmuch as it providesmeans wherebya pluralit ofpacking rings can be employed that wi effectively prevent leakage aroundthe piston rod.

From the foregoing, it' is thou'ghtthat the construction, operation andmany advantages of the herein described-invention will be apparent tothose skilled in-the art, without further description, and it will beunderstood that various changes in the size, shape, proportion and minordetails of construction, may be resorted to without departing from thespirit or sacrificing any of the advantages of the invention- Havingthus fully described my invention,

what I claim as new, and desire to secure by Letters Patent, is:-

lwln mechanism of. the character described, the combination' with 'acylinder,

of a reciprocatory piston operating'therein and having a piston rod proecting from one end, a bushing surrounding the projecting portion of therod and closing the end of the cylinder, said bushin comprising se aratelongitudinal sections having a plura ity of annular packing-receivinggrooves on its interior face, the exterior face of the bushing beingcontinuous unbroken and uniformly tapered from its point of largestdiameter to its outer end, said point of greatest diameter being locatedadjacent to the cylinder, a.

shell surrounding the bushing and having a continuously and uniformlytapered bore corresponding to the taper of the bushing and receivingthe-same, and resilient means entirely out of engagement with thebushing acting to continuously force the shell inwardly toward thecylinder to force the sections of the bushing together and'to hold thebushing in place on the end of the cylinder.

2. In mechanism of the character described, the combination with acylinder, of a reciprocatory piston operating therein and having apiston rod rojccting from one end, a bushing surrouncing the projectingportion of the piston rod and comprising separable longitudinal sectionshaving a plu-i rality of annular packing-receiving grooves, said bushinhaving its inner end extending into the cy inder and having its portionof greatest diameter substantiallyequal to that of the cylinder andlocated adiacent to the end of said cylinder, the outer face of thebushing tapering continuously, uniformly and unbrokenly from saidportion to its outer end, a shell surrounding the bushing and having acontinuously and uniformly tapered bore that receives the tapered ortionof the bushing, the portion of the bore of greatest diameter receivingthe end of the cylinder and the largestportlon of the bushing andpermitting the shell to slide beyond the largest portion of the bushingand over said cylinder, and means for drawing the shell inwardly towardthe cylinder to clamp' urroun'ding the bushing and having a continuouslyand uniformly tapered bore corresponding to the taper of the bushing andreceiving the same, holding rods passing through the shell entirelyexterior to the bushin and not in engagement with the same, an springsmounted on said holding rods and bearing against the shell tocontinuously ur e the same toward the cylinder and there y for e thebushing sections together about the iiiston ro 4. In mechanism of thecharacter described, the combination With a cylinder, of a reciprocatorypiston operating thereinand having a piston rod dprojecting from oneend, a bushing surroun mg the projecting portion of the piston rodandcomprising sep arable longitudinal sections having a plurality ofannular packing-receiving grooves, said bushing having its portion ofgreatest diameter located adjacent to the cylinder and having a necksmaller than the greatest diameter of the bushing by the thickness ofsaid cylinder adapted to project into the cylinder and surround theiston rod, said bushin having its outer ace tapered unbrokenIy,continuously and uniformly. from its greatest diameter to its outer end,a shell surrounding the bushing and having a continuously and uniformlyta ered bore corresponding tothe taper of t e bushing and receiving thesame, said shell being of .suchinterior diameter as will permit it to bedrawn back on the bushing past the point of greatest diameter thereof,packing between .the end of the cylinder and the bushing and surroundingthe neck of the latter, and re:- silient means for drawing the shelltoward the cylinder and thereby force the bushin sections to ether aboutthe piston rod an hold them in place within the cylinder.

In testimony, that I claim the foregoing as my own, I have heretoafiixed my signature in the presence of two witnesses.

JAMES PETRIE.

Witnesses:

CHARLES ADAM, ROBIN C. SHEEDY.

